First, we will create the externally exposed interface.
首先，我们将创建对外公开的接口。
The business component that relies on the DAO USES the simpler interface exposed by the DAO for its clients.
依赖于DAO的商业组件只对他的客户端暴露一些非常简单的DAO外部接口。
The data exposed on the service interface comes from the underlying database via the application code.
这个服务接口公开的数据是通过应用程序代码从底层数据库获得的。
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